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11-12-2009, 03:40 PM
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#1
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Join Date: Oct 2009
Posts: 443
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Other ratios for overdrive?
In the 4th gen auto trans, is there any manufacturer that makes over drive gear in a 0.6:1 or 0.55:1 ratio? Been looking, but can't find one.
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1998 Firebird Coupe
Mods: 3.73 Gears, Eaton TrueTrac, PCM Tune, LS1 Aluminum Drive Shaft, Cold Air Intake, 180 Thermostat, Magnaflow Cat-Back Exhaust, Moog LCA busings.
My Firebird Projects : Click Here
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11-12-2009, 03:54 PM
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#2
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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Not that I have seen. I guess you could look into a gear vendors unit.
What are you trying to accomplish?
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Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
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11-12-2009, 04:17 PM
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#3
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Join Date: Oct 2009
Posts: 443
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If steeper overdrive gears were available, I would put in 4.10's and offset the loss of cruising economy with the steeper overdrive.
Not sure how the PCM would handle the different ratios and speedo.
just a thought.
__________________
1998 Firebird Coupe
Mods: 3.73 Gears, Eaton TrueTrac, PCM Tune, LS1 Aluminum Drive Shaft, Cold Air Intake, 180 Thermostat, Magnaflow Cat-Back Exhaust, Moog LCA busings.
My Firebird Projects : Click Here
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11-12-2009, 04:35 PM
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#4
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Yeah, I haven't seen anything for that. A Gear Vendors would be the only way.
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11-12-2009, 05:17 PM
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#5
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Join Date: Jul 2009
Location: barnegat nj
Posts: 1,340
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there is no gear ratio your looking for 4th.
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Quote:
Originally Posted by SRGN
I never pulled into the staging beams at the track and saw a dyno in the other lane.
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South Jersey Racecraft
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11-12-2009, 06:54 PM
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#6
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Join Date: Oct 2009
Posts: 443
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Quote:
Originally Posted by WildBillyT
Yeah, I haven't seen anything for that. A Gear Vendors would be the only way.
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Yeah, but they are $3000. Cool stuff though.
Quote:
Originally Posted by S.J.SLEEPER
there is no gear ratio your looking for 4th.
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LOL! 4th is 0.7:1 ratio.
__________________
1998 Firebird Coupe
Mods: 3.73 Gears, Eaton TrueTrac, PCM Tune, LS1 Aluminum Drive Shaft, Cold Air Intake, 180 Thermostat, Magnaflow Cat-Back Exhaust, Moog LCA busings.
My Firebird Projects : Click Here
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11-12-2009, 09:05 PM
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#7
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Join Date: Jul 2009
Location: barnegat nj
Posts: 1,340
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Quote:
Originally Posted by Mark42
LOL! 4th is 0.7:1 ratio.
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yeah, i know, i was sayin that there is no optional ratio for 4th.
and fyi it is exactly .696:1 !!!
the 6l80e 6th gear is .667 don't know if your able to retrofit it or not, just figured i would share that. 
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Quote:
Originally Posted by SRGN
I never pulled into the staging beams at the track and saw a dyno in the other lane.
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South Jersey Racecraft
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